[Bug 111966] [bisected] GDM Login screen doesn't show up on kernel 5.3 or later

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111966

Lakshmi <lakshminarayana.vudum at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jani.nikula at intel.com

--- Comment #5 from Lakshmi <lakshminarayana.vudum at intel.com> ---
(In reply to Masami Ichikawa from comment #0)
> 1. problem
> 
> Boot with kernel 5.3 or later, GDM login screen doesn't show up.
> Following log is displayed in console.
> 
> Starting Show Plymouth Boot Screen...
> 
> When I remove rhgb and quiet from kernel command line, it shows gray
> background screen and blinking.
> 
> Kernel 5.2.18 doesn't have such issue.
> I checked 5.2.18(fedora kernel) and 5.2.18(stable release) both works fine.
> 
> I've tested drm-tip tree(HEAD is ec6a1544198d81f34a367bfb18173e402bbee0fa).
> The drm-tip tree kernel has same issue.
> 
> 
> 2. Steps to reproduce the issue. 
> 
> Boot with kernel 5.3 or later
> 
> 3. How often does the steps listed above trigger the issue?
> 
> always
> 
> 4. The following information about your system:
> 
> system architecture: x86_64
> kernel versions: 5.4-rc2(mainline), 5.4-rc2(drm-tip), 5.3.2(fedora kernel),
> 5.3.2(stable release)
> Linux distribution: Fedora 30
> Display connector: HDMI and DIV
> /sys/class/drm/card0/error: I'll attach
> dmesg: I'll attach
> xrandr output: I'll attatch (taks this output on kernel 5.2.18)
> VBIOS dump: I'll attach
> 
> 5. bisect
> 
> If I did bisect correctly, "drm/i915/bios: make child device order the
> priority order(36a0f92020dc8794d3aa69b7fb4c5d2bf99b0099)" is first bad
> commit. previous commit "drm/i915: Enable
> intel_color_get_config()(3633e5116dfb01f98de4c88daf2c673c52290755)" works
> fines.
> 
> I took dmesg, /sys/class/drm/card0/error, VBIOS dump on drm-tip kernel.

Jani, any comments?

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